Update php Docker tag to v8.5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
php	stage	minor	8.1-alpine → 8.5-alpine

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.07%. Comparing base (5efc56e) to head (136ddf4).
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #30   +/-   ##
=========================================
  Coverage     77.07%   77.07%           
  Complexity      225      225           
=========================================
  Files            25       25           
  Lines           541      541           
=========================================
  Hits            417      417           
  Misses          124      124           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.